Velocette Viper: MOT pass rate by registration year

Which Viper years pass first time, and which fall short of the model's 93.8% average, from 1,970 DVSA tests.

1962

highest-passing year · 98.8%

1957

lowest-passing year · 92.3%

6.5pp

spread across 9 years

Pass rate by registration year

first-time pass rate · cohorts with 50 or more tests · registration year from first use date

Highest pass rate: 1962 (98.8% of 254 tests). Lowest: 1957 (92.3% of 65).

Registered	Tests	First-time pass	vs model (93.8%)
1956	51	98.0%	+4.2 pp
1957	65	92.3%	-1.5 pp
1958	131	93.1%	-0.7 pp
1959	158	92.4%	-1.4 pp
1960	469	93.2%	-0.6 pp
1961	337	94.1%	+0.3 pp
1962	254	98.8%	+5.0 pp
1963	199	93.0%	-0.8 pp
1965	124	93.5%	-0.3 pp

Older cohorts are survivors: the worst examples have already left the road, which tends to lift the earliest years. A first-time MOT pass is a roadworthiness check, not a full mechanical inspection.

Pass rate over time

first-time pass rate by test year · 2005–2018

Questions

Which Viper years have the lowest MOT pass rate?: none: no registration year of the Velocette Viper falls more than two points under the model's 93.8% overall pass rate.
Which Viper year has the highest MOT pass rate?: 1962, at 98.8% of 254 first tests (2005–2025). Years more than two points above the model average: 1956, 1962.
How much does the Viper pass rate vary by year?: 6.5 percentage points between the highest (1962, 98.8%) and lowest (1957, 92.3%) cohorts with at least 50 tests. Older cohorts are survivors: the worst examples have already left the road, which tends to lift the earliest years.

Full report: Velocette Viper reliability, failures and mileage · ranked #198 of 5428 models· other Velocette models: Venom, Le, Mac, MSS, Thruxton, KSS